Such is the logic of luxury economics: charge tens of thousands of dollars more for the same product, sell fewer of them and boost the balance sheet and your brand's long-term viability. That is what Aston Martin's considering for the next phase of its business plan, which runs from roughly 2011 to 2019 and will see the launch of DB9 and Vantage successors, the Rapide, and the renewed Lagonda brand.